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Cheap flights from Knoxville to Portugal from $638

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Knoxville to Portugal departing on 1/7. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Cheap round-trip flights

United Airlines Logo
10:16 am - 9:20 amTYS-LIS
18h 04m2 stops
United Airlines Logo
11:20 am - 10:33 pmLIS-TYS
40h 13m2 stops
$638United Airlines
Find Deal
mié., ene. 7 - sáb., ene. 17
Air Canada Logo
5:50 am - 9:20 amTYS-LIS
22h 30m2 stops
Air Canada Logo
11:20 am - 6:42 pmLIS-TYS
36h 22m2 stops
$639Air Canada
Find Deal
mié., ene. 7 - sáb., ene. 17
British Airways Logo
11:03 am - 6:55 amTYS-LIS
14h 52m1 stop
British Airways Logo
10:30 am - 8:43 pmLIS-TYS
15h 13m1 stop
$650British Airways
Find Deal
mié., ene. 7 - sáb., ene. 17
British Airways Logo
11:03 am - 6:55 amTYS-LIS
14h 52m1 stop
British Airways Logo
10:30 am - 8:43 pmLIS-TYS
15h 13m1 stop
$655British Airways
Find Deal
mié., ene. 7 - sáb., ene. 17
American Airlines Logo
7:56 am - 6:55 amTYS-LIS
17h 59m1 stop
American Airlines Logo
10:30 am - 11:45 pmLIS-TYS
18h 15m2 stops
$659American Airlines
Find Deal
mié., ene. 7 - sáb., ene. 17
Logo
7:15 am - 5:30 amTYS-LIS
17h 15m1 stop
Logo
12:05 pm - 11:55 amLIS-TYS
27h 50m2 stops
$685
Find Deal
vie., oct. 24 - jue., oct. 30
Logo
7:15 am - 5:30 amTYS-LIS
17h 15m1 stop
Logo
6:45 pm - 11:55 amLIS-TYS
21h 10m1 stop
$733
Find Deal
vie., oct. 24 - jue., oct. 30
Lufthansa Logo
2:00 pm - 12:35 pmTYS-FAO
17h 35m2 stops
Lufthansa Logo
2:10 pm - 6:42 pmFAO-TYS
33h 32m2 stops
$794Lufthansa
Find Deal
vie., feb. 6 - mié., mar. 4
American Airlines Logo
7:00 am - 9:05 amTYS-LIS
21h 05m1 stop
American Airlines Logo
11:05 am - 8:44 pmLIS-TYS
13h 39m1 stop
$885American Airlines
Find Deal
dom., oct. 12 - mar., oct. 28
Lufthansa Logo
7:25 pm - 1:00 amTYS-FNC
24h 35m2 stops
Lufthansa Logo
3:20 pm - 7:29 pmFNC-TYS
33h 09m2 stops
$1,329Lufthansa
Find Deal
mié., dic. 3 - dom., dic. 7

United Airlines flights from Knoxville to Portugal

Our best United Airlines deals on Knoxville to Portugal flight tickets
United Airlines
Jan 7
TYS10:16 amKnoxville McGhee Tyson
18h 04m
2 stops
LIS9:20 amLisbon Humberto Delgado
Jan 17
LIS11:20 amLisbon Humberto Delgado
40h 13m
2 stops
TYS10:33 pmKnoxville McGhee Tyson
$638
Find similar
United Airlines
Oct 24
TYS8:50 amKnoxville McGhee Tyson
18h 30m
2 stops
LIS8:20 amLisbon Humberto Delgado
Nov 4
LIS5:00 amLisbon Humberto Delgado
20h 20m
2 stops
TYS8:20 pmKnoxville McGhee Tyson
$648
Find similar
United Airlines
Dec 4
TYS7:00 amKnoxville McGhee Tyson
22h 15m
2 stops
LIS10:15 amLisbon Humberto Delgado
Dec 10
LIS5:00 amLisbon Humberto Delgado
19h 29m
2 stops
TYS7:29 pmKnoxville McGhee Tyson
$653
Find similar

American Airlines flights from Knoxville to Portugal

Our best American Airlines deals on Knoxville to Portugal flight tickets
American Airlines
Jan 7
TYS7:56 amKnoxville McGhee Tyson
17h 59m
1 stop
LIS6:55 amLisbon Humberto Delgado
Jan 17
LIS10:30 amLisbon Humberto Delgado
18h 15m
2 stops
TYS11:45 pmKnoxville McGhee Tyson
$659
Find similar
American Airlines
Oct 12
TYS7:00 amKnoxville McGhee Tyson
21h 05m
1 stop
LIS9:05 amLisbon Humberto Delgado
Oct 28
LIS11:05 amLisbon Humberto Delgado
13h 39m
1 stop
TYS8:44 pmKnoxville McGhee Tyson
$885
Find similar
American Airlines
Sep 24
TYS7:18 amKnoxville McGhee Tyson
20h 47m
1 stop
LIS9:05 amLisbon Humberto Delgado
Oct 2
LIS11:05 amLisbon Humberto Delgado
15h 09m
1 stop
TYS9:14 pmKnoxville McGhee Tyson
$1,015
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Knoxville to Portugal that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated agosto 21, 2025.
Use the filters below to find and compare flights from Knoxville to Portugal that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

mié. 1/7

10:16 am-9:20 am

2 stops18h 04m

Lisbon Humberto Delgado

sáb. 1/17

11:20 am-10:33 pm

2 stops40h 13m

$638

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

mié. 1/7

5:50 am-9:20 am

2 stops22h 30m

Lisbon Humberto Delgado

sáb. 1/17

11:20 am-6:42 pm

2 stops36h 22m

$639

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

mié. 1/7

11:03 am-6:55 am

1 stop14h 52m

Lisbon Humberto Delgado

sáb. 1/17

10:30 am-8:43 pm

1 stop15h 13m

$650

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

mié. 1/7

11:03 am-6:55 am

1 stop14h 52m

Lisbon Humberto Delgado

sáb. 1/17

10:30 am-8:43 pm

1 stop15h 13m

$655

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

mié. 1/7

7:56 am-6:55 am

1 stop17h 59m

Lisbon Humberto Delgado

sáb. 1/17

10:30 am-11:45 pm

2 stops18h 15m

$659

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

vie. 10/24

7:15 am-5:30 am

1 stop17h 15m

Lisbon Humberto Delgado

jue. 10/30

12:05 pm-11:55 am

2 stops27h 50m

$685

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

vie. 10/24

7:15 am-5:30 am

1 stop17h 15m

Lisbon Humberto Delgado

jue. 10/30

6:45 pm-11:55 am

1 stop21h 10m

$733

KnoxvilleFaro

TYS - FAO

TYSFAO

Knoxville McGhee Tyson

vie. 2/6

2:00 pm-12:35 pm

2 stops17h 35m

Faro

mié. 3/4

2:10 pm-6:42 pm

2 stops33h 32m

$794

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

dom. 10/12

7:00 am-9:05 am

1 stop21h 05m

Lisbon Humberto Delgado

mar. 10/28

11:05 am-8:44 pm

1 stop13h 39m

$885

KnoxvilleFunchal

TYS - FNC

TYSFNC

Knoxville McGhee Tyson

mié. 12/3

7:25 pm-1:00 am

2 stops24h 35m

Funchal Madeira

dom. 12/7

3:20 pm-7:29 pm

2 stops33h 09m

$1,329

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

See travel insights to Portugal from

How to get the cheapest flight ticket from Knoxville to Portugal

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Portugal?

The cheapest month to fly to Portugal from Knoxville is in January. Flight prices, which tend to average around $629, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of January, then book flights to Portugal from Knoxville during February instead. Flights to Portugal in February, while not as cheap as those in January, still average around $638.

What is the cheapest day to depart on your flight to Portugal?

According to our data, Monday is the cheapest day to fly to Portugal from Knoxville. The lowest ticket price found for a Monday departure recently was $819. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. The most expensive day to fly to Portugal is Saturday, with ticket prices averaging around $1,534.

What is the cheapest time of day to depart on your flight to Portugal?

Our most recent data shows that the best time of day to fly to Portugal is in the morning. Flights from Knoxville to Portugal during this time can be as low as $745. In the afternoon is when there is more demand to fly to Portugal, so prices are often more expensive at around $1,134 per ticket.

Can stopping save me money on Knoxville to Portugal flights?

You could potentially save up to 35% on your flight if you consider stops on a Knoxville to Portugal flight.

Cheap Knoxville to Portugal flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Knoxville to Portugal

Direct flights

None
There are no direct flights from Knoxville to Portugal. There are no popular flight routes from Knoxville to Portugal.
Search flight deals

  • When did momondo last update prices for flights from Knoxville McGhee Tyson Airport to Portugal?

    Prices for flights from Knoxville McGhee Tyson Airport to Portugal were last updated today.

  • How many operators does momondo search for flights from Knoxville McGhee Tyson Airport to Portugal?

  • How old do you have to be to fly from Knoxville McGhee Tyson Airport to Portugal?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Knoxville McGhee Tyson Airport to Portugal.

  • What documentation or ID do you need to fly to Portugal?

    The travel and health documents required for your trip to Portugal can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Portugal. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best airlines flying from Knoxville to Portugal

Compare and see reviews for airlines that fly from Knoxville to Portugal with momondo
Airline
Rating
Free Cancellation
Price
American AirlinesPriceFrom $580Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
British AirwaysPriceFrom $589Free CancellationRating
6.7
7,291 reviews
Search British Airways flights
United AirlinesPriceFrom $603Free CancellationRating
7.4
8,930 reviews
Search United Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Knoxville to Portugal?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Knoxville to Portugal. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Knoxville to Portugal with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Knoxville to Portugal flights to just show those with flexible booking policies.

How can momondo help me find flights from Knoxville to Portugal?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Portugal from Knoxville.

I’m not ready to book a flight from Knoxville to Portugal right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Knoxville to Portugal flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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Find better results for your trip to Portugal

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Popular flights according to clicks in the last 7 days on momondo
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